Fix output path when building from command line

Author: AArnott

src/Directory.Build.props

@@ -1,5 +1,6 @@
 <Project>
   <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <BaseIntermediateOutputPath>$(MSBuildThisFileDirectory)..\obj\$(MSBuildProjectName)\</BaseIntermediateOutputPath>
     <OutputPath>$(MSBuildThisFileDirectory)..\bin\$(MSBuildProjectName)\$(Configuration)\</OutputPath>
   </PropertyGroup>